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https://issues.apache.org/jira/browse/HDFS-10822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Zhuge updated HDFS-10822:
------------------------------
Attachment: HDFS-10822.001.patch
Patch 001:
* {{initDataStreaming}} is a better place to add DEBUG msg because the log msg
will have {{file}}, {{block}}, and {{pipeline}} all together.
* No unit test because the patch adds DEBUG msg only.
{{TestDataStream}} log that shows the new DEBUG msg:
{noformat}
2016-09-01 11:54:18,470 [DataStreamer for file /file1 block
BP-1484500550-172.16.1.255-1472756056162:blk_1073741825_1001] DEBUG
hdfs.DataStreamer (DataStreamer.java:initDataStreaming(512)) - nodes
[DatanodeInfoWithStorage[127.0.0.1:61765,DS-124a1018-6033-4f81-bc43-cba740bd9538,DISK]]
storageTypes [DISK] storageIDs [DS-124a1018-6033-4f81-bc43-cba740bd9538]
{noformat}
> Log DataNodes in the write pipeline
> -----------------------------------
>
> Key: HDFS-10822
> URL: https://issues.apache.org/jira/browse/HDFS-10822
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.6.0
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Trivial
> Labels: supportability
> Attachments: HDFS-10822.001.patch
>
>
> Trying to diagnose a slow HDFS flush, taking longer than 10 seconds, but did
> not know which DNs were involved in the write pipeline. Of course, I could
> search NN log for the list of DNs, but it might not be possible sometimes or
> convenient.
> Propose to add a DEBUG trace to DataStreamer#setPipeline to print the list of
> DNs in the pipeline.
> BTW, we do print the list of DNs during pipeline recovery.
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